Druid realtime index task bug

Hi all,
Recently, when I user spark streaming through tranquility write events to Druid, I got this:

        io.druid.java.util.common.ISE: Can not combine streams for version 2.
	at io.druid.segment.data.GenericIndexedWriter.combineStreams(GenericIndexedWriter.java:316) ~[druid-processing-0.10.1.jar:0.10.1]
	at io.druid.segment.StringDimensionMergerV9.writeIndexes(StringDimensionMergerV9.java:289) ~[druid-processing-0.10.1.jar:0.10.1]
	at io.druid.segment.IndexMergerV9.makeIndexFiles(IndexMergerV9.java:211) ~[druid-processing-0.10.1.jar:0.10.1]
	at io.druid.segment.IndexMerger.merge(IndexMerger.java:434) ~[druid-processing-0.10.1.jar:0.10.1]
	at io.druid.segment.IndexMerger.mergeQueryableIndex(IndexMerger.java:218) ~[druid-processing-0.10.1.jar:0.10.1]
	at io.druid.segment.IndexMerger.mergeQueryableIndex(IndexMerger.java:206) ~[druid-processing-0.10.1.jar:0.10.1]
	at io.druid.segment.realtime.plumber.RealtimePlumber$2.doRun(RealtimePlumber.java:415) [druid-server-0.10.1.jar:0.10.1]
	at io.druid.common.guava.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:42) [druid-common-0.10.1.jar:0.10.1]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_131]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_131]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]


   Is there any solutions to solve this problems?